请问colse the back cover open

请问colse the back cover open Look out!Don't get too colse to the house____roof is under repair.A.whose B.which C.of which.D.what我觉得A,C.选项都对,但答案是A,请问C为什么不能选? 将don't forget to close the door when you leave..改为同义句[ ] [ ] colse the door when you leave. 概率论协方差定理中,【cov（X,Y)】×【cov（X,Y)】《DX·DY.请问这个定理如何证明, 孙燕姿《the moment》的英文歌词要英文的!我听到有一句是I feel your mindI feel colse to you the back to back back the 距离很近用 near nearly colse 请问I had just started back for the house to change my clothes.中的back for Back in the Back 歌词 请问var(X)怎么读,还有cov（X,Y）怎么读? The car draw back/up outside the cinema 请问选择哪一个?为The car draw back/up outside the cinema请问选择哪一个?为什么? take a back 请问 sit at the back of the back sit at the back of the back The old man stood there,选择填空.A,with back against the wall B,with his back against the wall C,with back against wall D,his back against wall请问应该选择哪个啊? 请问back to back是什么意思啊? back face 请问哪位朋友 back face 与back cover